Major AEC3 render pipeline changes

This CL adds major render pipeline changes to the AEC3 code. The reason
for these are that
1) It allows the echo removal unit to receive information about the content
in bands beyond band 0, thereby allowing removal of high-frequency
echoes
2) It allows more controlled handling of the render buffers, allowing proper
buffer behaviour during capture glitches and clock-drift.

Unfortunately, the render pipeline caused a lot of related changes in much
of the rest of the AEC3 files. Most of these are, however, caused by
a change of class name.

Another unfortunate effect of this CL, is that a number of unittest cease to
compile. I chose to temporarily solve that by removing them from the
build using #if/#endif. The reason for that is that those will anyway again
need to be changed in the next review, and doing like this avoids them
having to be reviewed twice.

BUG=webrtc:6018

Review-Url: https://codereview.webrtc.org/2784023002
Cr-Commit-Position: refs/heads/master@{#17547}

webrtc/modules/audio_processing/aec3/render_delay_buffer.h

@@ -12,44 +12,46 @@
 #define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_RENDER_DELAY_BUFFER_H_
 
 #include <stddef.h>
+#include <array>
 #include <vector>
 
+#include "webrtc/base/array_view.h"
+#include "webrtc/modules/audio_processing/aec3/aec3_common.h"
+#include "webrtc/modules/audio_processing/aec3/downsampled_render_buffer.h"
+#include "webrtc/modules/audio_processing/aec3/fft_data.h"
+#include "webrtc/modules/audio_processing/aec3/render_buffer.h"
+
 namespace webrtc {
 
 // Class for buffering the incoming render blocks such that these may be
 // extracted with a specified delay.
 class RenderDelayBuffer {
  public:
-  static RenderDelayBuffer* Create(size_t size_blocks,
-                                   size_t num_bands,
-                                   size_t max_api_jitter_blocks);
+  static RenderDelayBuffer* Create(size_t num_bands);
   virtual ~RenderDelayBuffer() = default;
 
-  // Swaps a block into the buffer (the content of block is destroyed) and
-  // returns true if the insert is successful.
-  virtual bool Insert(std::vector<std::vector<float>>* block) = 0;
+  // Resets the buffer data.
+  virtual void Reset() = 0;
 
-  // Gets a reference to the next block (having the specified buffer delay) to
-  // read in the buffer. This method can only be called if a block is
-  // available which means that that must be checked prior to the call using
-  // the method IsBlockAvailable().
-  virtual const std::vector<std::vector<float>>& GetNext() = 0;
+  // Inserts a block into the buffer and returns true if the insert is
+  // successful.
+  virtual bool Insert(const std::vector<std::vector<float>>& block) = 0;
 
-  // Sets the buffer delay. The delay set must be lower than the delay reported
-  // by MaxDelay().
+  // Updates the buffers one step based on the specified buffer delay. Returns
+  // true if there was no overrun, otherwise returns false.
+  virtual bool UpdateBuffers() = 0;
+
+  // Sets the buffer delay.
   virtual void SetDelay(size_t delay) = 0;
 
   // Gets the buffer delay.
   virtual size_t Delay() const = 0;
 
-  // Returns the maximum allowed buffer delay increase.
-  virtual size_t MaxDelay() const = 0;
+  // Returns the render buffer for the echo remover.
+  virtual const RenderBuffer& GetRenderBuffer() const = 0;
 
-  // Returns whether a block is available for reading.
-  virtual bool IsBlockAvailable() const = 0;
-
-  // Returns the maximum allowed api call jitter in blocks.
-  virtual size_t MaxApiJitter() const = 0;
+  // Returns the downsampled render buffer.
+  virtual const DownsampledRenderBuffer& GetDownsampledRenderBuffer() const = 0;
 };
 
 }  // namespace webrtc